Transformer.



s. E. JOHANNESEN. TRANSFORMER. APPLICATION FILED JUNE 21,1913.

15159326; Patented Nov. 2, 1915.

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Specification or netters Patent.

Application filed Zfune 21, 1913. Serial l lo. 72 52608.

and useful Improvements 1 in Transformers,

of whichthe following is a specification." This invention relates to transformers,

and particularly to such as are used for high tension work and in whicl'r it is desired-to have a high reactance. v

Heretot'ore hlgh reactan'ce trans-formers have been made by placing a magnetic shunt of laminated iron strips-between. the primary and secondary windings, the strips eatending in the general direction of and forming agpath for the leakage flux. This arrangement has not proven entirely satisfactory owin .tofthe difficulty of anchoring the strips wit sufficient rigidity to withstand the mechanical stresses to which they are subjected in case of an overload andto the fact that the design does-not give a straight line reactance from no load to full load.

By the present invention it is proposed to make this magnetic shunt preferably in the form of a flat iron strip wound in the form ot'a spiral on one of the coils. It has been found that such a structure gives practically a straight'line reactanc e from zero to a load considerably above normal and that the mechanical diiliculti'es experienced with former designs are overcome. v

Referring to the drawing Figure l is a view partially-in section illustrating more or less diagrammatically the preferred embodiment or my invention. Fig. 2 is a section of i.

In thev drawings 1 is the core of an orditype of transformer having wound thereon the primary winding; 2 and the secondary winding 3. Between these windings is located the magnetic shunt member at. This member is made up of one or more flat strips of iron the strands or strips suitably insulated from each other and wound in the form of a spiral directly on the secondary winding. One end of this strip is shown at 5, being grounded on the core of the transformer. being thus'grounded on the core the magnetic shunt between the two windings has the additional advantage of acting as electric shield, in a fashion disa" the strains'between each winding i j y Y.

and ground, the core being normally at ground potential, and receiving and conductingto ground. the discharges from either coil, thus saving the other coil from The design of this transformer is a flexible one, readily, adaptable to give a, long range of reactance values-for a given line of"- transformers; using the same stock various degrees or reactance be obtained in different transformersby changing the pitch of-the spiral of the shunt to thereby vary the distance between ad acent turns. I

What l claim as new and desire to secure by Letter Patentof the United States, is

1. In a transrormer, the comblnation of a primary winding, a secondary winding and spirally wound member forming a netic shunt for each winding from the other associated with said windings.

2. In a transformer, the combination of a primary winding, a secondary winding, and a spirally wound member forming a magnetic shunt for each winding from the-other and located betweenjsaid windings.

. 3. in a transformer, the combination of a .core, a primary winding and a secondary winding thereon and a spirally wound memberrorming a magnetic shunt for each winding from the other and located between said windings, one end of said spirally wound member being grounded on said core.

4. In a transformer, the combination of a cylindrical primary winding, a cylindrical secondary winding, the windings being located one within the other, and a member of magnetic material wound spirally about the inner of said cylindrical windings between the windings.

5. In a transformer, the combination of a primary winding, a secondary-winding,

, and a magnetic shunt for each of the windings from the other located between said wlndmgs and comprising a plurality of portions extending substantially perpendicularly to the direction of the leakage flux and spaced apart in the direction of the leakage flux. 1

In witness whereof, I have hereunto set my hand this 18th day of June 1913.

S nhl l) JOEANNESEN.

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